51481243 has 8 divisors (see below), whose sum is σ = 56217456. Its totient is φ = 46754400.

The previous prime is 51481237. The next prime is 51481247. The reversal of 51481243 is 34218415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51481243 - 2⁹ = 51480731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51481247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14373 + ... + 17593.

It is an arithmetic number, because the mean of its divisors is an integer number (7027182).

Almost surely, 2^51481243 is an apocalyptic number.

51481243 is a deficient number, since it is larger than the sum of its proper divisors (4736213).

51481243 is a wasteful number, since it uses less digits than its factorization.

51481243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4685.

The product of its digits is 3840, while the sum is 28.

The square root of 51481243 is about 7175.0430660728. The cubic root of 51481243 is about 372.0057688819.

Adding to 51481243 its reverse (34218415), we get a palindrome (85699658).

The spelling of 51481243 in words is "fifty-one million, four hundred eighty-one thousand, two hundred forty-three".